import java.util.concurrent.TimeUnit;

public class StackStrTest {
    public static void main(String[] args) {
//        int i = 2 + 3;
        int i = 2;
        int j = 3;
        int k = i + j;
        try {
            TimeUnit.SECONDS.sleep(10);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("hello");
    }
}
